(a) Except as necessary to administer this subchapter or on written authorization of the employee, the following information is confidential:
(1) whether a district employee has authorized a deduction under this subchapter;
(2) the amount of the deduction; and
(3) the name of a federation or fund or charitable organization that a district employee has designated to receive contributions.
(b) The designation of a charitable organization by a district employee is not confidential if the employee executes a written pledge card or other document indicating that the employee wishes to receive an acknowledgement from the charitable organization.